<!DOCTYPE html>
<html lang="en">
<head>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <meta charset="UTF-8">
    <title>登录页面</title>
    <link href="css/public.css" rel="stylesheet">
    <script src="https://cdn.bootcss.com/jquery/3.4.1/jquery.js"></script>
    <script src="https://cdn.bootcss.com/popper.js/1.15.0/esm/popper-utils.js"></script>
    <link href="https://cdn.bootcss.com/twitter-bootstrap/4.3.1/css/bootstrap.css" rel="stylesheet">
    <script src="https://cdn.bootcss.com/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>



</head>
<body class="centered">

<ul class="nav nav-tabs">
    <li class="nav-item">
        <a class="nav-link active" id="test" href="#">Active</a>
    </li>
    <li class="nav-item dropdown">
        <a class="nav-link dropdown-toggle" data-toggle="dropdown" href="#" role="button" aria-haspopup="true" aria-expanded="false">Dropdown</a>
        <div class="dropdown-menu">
            <a class="dropdown-item" href="/mode.html.html">Action</a>
            <a class="dropdown-item" href="test.html">Another action</a>
            <a class="dropdown-item" href="#">Something else here</a>
            <div class="dropdown-divider"></div>
            <a class="dropdown-item" href="#">Separated link</a>
        </div>
    </li>
    <li class="nav-item">
        <a class="nav-link" href="#">Link</a>
    </li>
    <li class="nav-item">
        <a class="nav-link disabled" href="#" tabindex="-1" aria-disabled="true">Disabled</a>
    </li>
</ul>

<iframe width="100%" height="100%">

</iframe>

</body>
<script>

</script>
</html>